Milling machine



July 31, 1945. N M. MARSILIUS MILLING MACHINE Filed July 21, 1942 4Sheets-Sheet INVENTOR Newman MMm-sz'lius BY a?" Z ATTORNEY MILLINGMACHINE Filed July 21, 1942 4 Sheets-Sheet 2 INVENTOR Newm an M Marszhus0 RNEY July 31, 1945. N. M. MARSILIUS 2,380,859

MILLING MACHINE Filed July 21, 1942 4 Sheets-Sheet 4 if; f

6.9 $3 7/ as f r I ,j" 57 76 [lg 77 76 g INVENTOR 7756 56 '6' NewmanMMarsllws BY I I I I A ORNEY t Fatenied July 31, 1945 um'rso s'rA'rssPATENT OFFICE zssasss mums moms Newman M. Marslllas. Bridg p t Conn-Application July 21. 1942, Serial No. 451.:

(CL sis-15.1)

11 Claims.

This invention relates to new and useful improvements in machine toolsand has particular relation to a milling machine especially adapted formilling the bevelled face or end of each spiral flute of spot facing andother types of tools having spiral flutes although the machine may beused for the making of bevelled or inclined cuts on or in other work.

The objects and advantages of the invention will become apparent from aconsideration of the following detailed description taken in connectionwith the accompanying drawings wherein a satisfactory embodiment of theinvention is shown. However, it is to be understood that the inventionis not limited to the details disclosed but includes all such variationsand modiflcations as fall within the spirit of the invention and thescope of the appended claims.

In the drawings:

Fig. i is a top plan view of the machine of the invention;

' Fig. 2 is a side elevational view of said machine;

Fig. 3 is a rear elevatlonal view showing the means for driving thevarious active parts of the machine;

Pig. 4 is a front elevational view. on a larger scale than Figs. 1 and2, of the upper portion of the machine, the base being broken away;

Pig. 5 is a detail sectional view. on the scale of Pig. 4, the viewbeing taken as along the plane of the line H of Pig. 1; and

Pig. 6 is a detail sectional view, taken as alonstheplaneofthelinea-lofrigJ.

The present machine is especially designed forthemiillngofthefaceorendofeachfluteofa spot facing or other fluted toolthe spiral flutes of which have been cut as disclosed in my copendingapplication Serial Number-461,692, flied Jub 21, 1942, although themachine may be used for other work. To the desired end the presentmachine includes adjustable means for supporting the work in the properrelation to a cutter whereby the free end of each flute in theworkwillbecutlntheproperrelationtcthe flute regardless of the pitch ofthe latter.

Referring in detail to the drawings the machine of the invention asshown includes a base II, which is hollow and generally rectangularincluding anupper or top wall ll carrying pads ll mounting a bed ll.Base wail H inclines toward the forward end of the machine to drainthrough a chamber ll into a sump It. A screen I! in the bottom wall'ofchamber ll serves to remove from coolant being returned to sump ll chipsand the like and these chips may be removed from the chamber through anopening i1 while the sump is provided with a clean-out door ll.

Fixed on or integral with the bed It is a. sup port It in which ismounted, for horizontal movements, a slide 20 at its forward endcarrying a tool head generally designated It. On the bed to one side ofthe support I! and head II is a work holder generally designated 2! andlater to be fully described. Support ll has a dovetailed groove openingthrough one side and each end thereof and slide fl is mounted in andmovable through said groove. At its forward end slide 20 carries a head28 dove-tailed in plan and mounting. for vertical movements, 2. toolhead 2!. The latter includes a block I mounted on head 28 and in turnhaving mounted thereon, for vertical adjustment. a plate 2! carrying acutter holder and driving means fl.

T-bolts 21 secure plate 2| in position to the block N and a verticaladjusting screw 2| passing through a ledge-like portion of said block issecured to the said plate and is adapted for manipulation to raise andlower the plate and the cutter holdeLJI when the bolts 21 are loosened.A somewhat similar screw 2! is adapted for manipulation to adjust theposition of the block 24 vertically relative to the head 23. Coilsprings II located in recesses or sockets in the head 23 pressingagainst plungers Ii carried by the block 24 constantly tend to raisesaid block and the cutter holder and driving means 20.

A flange I! on the upper side of block 24 has a plate 33 mounted thereonby a pivot 1. and a pair of bolts ll located at the opposite sides ofsaid pivot and passing through enlarged holes or slots 80 in the plateare adapted to clamp e latter to the flange it in the desired position 0adjustment about pivot I. On loosening of bolts 8| other and verticallydisposed bolts :1 are manipulated to move plate 33 to the desired angleand thereafter bolts 8| are tightened.

Hearing on the upper side of plate 38 is a stud II carried by theforward end portion of a cutter lever 00 pivoted at N to the support ll.The forward end of the lever I! is split as at ll and a bolt l2 passingthrough such end is adapted tobeti'ghtenedtoclampthestuduinplace.Onlooseningofsaidboltandnutsflontne upper end of said stud a nut is maybe turned onthestudlnrelationtoadialfltomake micrometer adjustments ofthe stud with relation to the forward end portion of the lever It.

-operationonworkheidby 2 Cam means (as will be described) serve to rocklever to in timed relation with motion of other parts of the machine andit will be clear that the springs I. serve to maintain plate 83 againstthe lower end of the stud 3i and that the lever 88 through said stud mayoperate to depress thebiockilontheheadfi.

The cutter holder 2 includes a chuck 46 carried by the forward end of aspindle or shaft 40 mounted in the holder 2| and within a casing 41forming part of said holder. having fixed thereto a worm gear 48 meshingwith and driven by a worm is on a short shaft 50. Shaft I. is driven ina manner to be described. Holder 16 above shaft 40 has a split portionii provided with a socket 82 adapted to receive a support (not shown)for the outer end of the spindle of a milling cutter It the inner endportion of whose spindle is in the chuck I. on tightening of bolts itsuch split portion II is drawn tight onto the mentioned support tosecure the same in position.

Work holder 22 comprises a base il including a circular projection 56 onits under sideand turnabLv received in a circular recess or openin: I!in the bed It. Aside from the proiection II the remaininiipm-tions ofthe base rest on the upper side of the bed It and support a pair ofspaced bearings II and it beyond the outer sides of which portions ofthe base extend and througharcuate slots in which portions bolts ll andII pass. A tubular shaft 0: is mounted by the bear-inns II and it and atits forward end mounts a chuck N for receiving the shank of a tool orpiece of work 04. the end faces of the flutes of which are to bebevelled. Work N is the same piece the flutes of which have been cut asin the machine of my companion application above mentioned.

Fixed on the shaft 82 between the bearlnas isandllarealockinzdisoltandaninderinz disc to while a member 01 at theforward side ofthe indexinadiscllisalsoontheshaftbut is turnable aboutthe same. The hub-like portion of member 1' is provided with aear teethllandsaid member includes-anarm "in the outer end portion of which ispivoted a pawl II for cooperation with the notches ll of the indexinadisc. hleshina with the teeth 08 of themembertlaretheteethofaraokbarlfmounted for vertical movement in a guidedevice 18 carried by the base II and extending-thrown theproiection ll.Aooilsprina'llisconnected atitsupperendtoaproiectionflontherackbarandatitslowe'rendisanohoredtothebase I.Thissprinaservesaswillbesetforth.

Thebarli ishollow and passinatherethrouahisabarorpin'lothelowerendofwhichisdispoeedonanendportionofarockerbarl'landthe upper end of which projects above the rack burand'is providedwithahead-like portion 10 bymeansofwhich'itmaybeturnedtoadiustitverticallythrouahtherackbar. Tothisendthepin-isthreadedtotherackbarandfoilowina anadiustmentislockedinpositionIf. .Byadlustina the lower'end throuahthelowerendoftherackmentwhichwillbeimpartedtothelatter'by the rockerbarl'liscontrolled.Discolisprovided withopeninasorreeessesllinitsp riph r analoekinafinaerorpinolisadaptedtoenterone ofthese notchestolockthedisc"and thereby theshaft s: inflxed position thechuck". astoporlocatinaiinaerflismountedbyabraeket" durinlacuttina- 'that the'driveto the cam It. From a pulley I on said shaft a belt it.

drivesapulleyal ontheshaftofapump l2 whereby the latter is operated tosupply coolant to the cutter I: as will be understood. the piping forthe coolant not beinl shown. On shaft is are years It and u drivinz,respectively. gears Ii and-It on shafts l1 and ll respectively.

- Fixedon shaft I1 is a pulley I! which through a belt it. drives apulley ill on a short shaft ll! coupled with a flexible, extensibledriving shaft m tnrouaii a universal joint m. At its forward end shaft Iis coupled through a miversal joint I" with the short shaft I mountinsthe worm 48. On shaft II is fixed a pull I" which through a belt Illdrives a pulley Nil mounted on a shaft Ill and coupled in drivingrelation therewith through a clutch means H0. Fixed on shaft I" is aworm ill meshina with aworm sear HIilxedon-acamshaftiliextendinatransverselyofthebed ltattherearend thereof and rotatablymounted in bearinas .lll supported from said bed. A suitable casinl llencloses the worm and worm gear.

Clutch Iiliscontrolledbyayoke litto which is connected anoperatina rodill extendina forwardly over the bed It to a point somewhatbeyondmidwayofthela Rodiilpaases throuch guides lit onthebedandacoilsprins lit about a portion of the at itsgean a H0 is to shift the yokelit to a position openina or the clutch. Near its forward end rod H1 isprovided in its upper portion or side with a notch and when the clutchIII is coupled to have the pulley I" drive the worm ill, a latch iii,pivoted at m, is enterin: said notch and holdina therodagainstthetendencyofthesprinz.

'1he machineofthe trip pin I23 (see Fla. strikes the upper side of theinner end portion of latch iii and rocks the latter on its pivot If!lifting its outer portion from the notch in the rod H1. Thereuponthesprinz III functions to shift therodanddisconnectthe clutchlilbrinainathemachinetoastop. Thusitwill beseen shaft H3 ,is stopped atthe end of each complete cycle of the machines operation. Uncouplin: ofthe clutch involves the movement of pulley ill to shift the pulleycarried clutch element it from the shaft carried clutch element Ill. Alever m is provided for manual movement of the rod ill when couplins theclui'oh ill.

Mounted onthe shaft III are an indexing cam I21, an index lockina camI28, a cutter lever if! and a slide operatinz cam of the rocker bar I1.is located below the ends'is pivoted at tho of the forward end portionof the bar I1 is engaged by the lower end of the pin I6 of the rack bar12.

Riding on the cam I28 is a roller I36 carried by an arm or portion I31of a lever generally designated I38 and in addition to the rear portionI31 including a forward portion I38. Lever portion I39 is pivoted to thesupport I9 as at I40 and the forward end of such lever portion I3! ispivoted to the rear portion of the lever at I. Portion I31 carries ascrew I42 adjustable against portion I39 to lock such portions togetherso that as the high portion of cam I28 moves under the roller I36 theentire lever I38 will be rocked on its pivot I40. Under suchcircumstances the forward end of the lever being against the top end ofpin BI the latter will be depressed to force its lower end into one ofthe recesses 80 in the locking disc 65. On the high portion of cam I28receding a spring I43 about the pin 8| elevates the latter and rocks thelever I38 on pivot I40 maintaining the roller I36 against the cam I28and raising the pin 8I out of locking relation with the disc 65.

Riding on cam I29 is a roller I44 carried by the rear end portion of thecutter lever 33. Since such lever is pivoted intermediate its ends at 40it will be clear that as the high portion of cam I39 moves under rollerI44 the rear end portion of lever 39 will be raised and its forward endportion lowered so that the stud 38 will force the block 24 and thecutter head 26 downwardly on the head 23 to shift the cutter 53 towardthe work 64. This will be against the tendency of the springs 30 andtherefore as the high portion of cam I29 recedes from roller I44 thesaid springs will serve to return the block 24 and parts carried therebyto their normal positions and rock the cutter lever 39 in the oppositedirection maintaining the roller I44 against the cam.

A roller I45 rides against the cam I30 and such roller is carried by ablock I46 bolted to the slide 20 as at I41. A micrometer adjusting screwI48 passes through a lug I49 n the slide and is threaded into the blockI46 whereby on loosening of the screws I the said micrometer adjustingscrew may be manipulated to adjust the roller I45 relative to the camI30. Thereafter the bolts I41 are tightened to secure the block I46rigid with the slide. With this arrangement it will be understood thatas the high portion of the cam I 30 engages the roller I 45 the slide 20and all parts carried thereby will be moved forwardly relative to thesupport I9.

A flexible connector as the chain I50 is secured to the rear end portionof slide 20 and passes over pulleys II at the rear of the machine andthen under bed I3 where it is connected to one end of a coil spring I52anchored to a screw I53. With this construction as the high portion ofcam I30 recedes from roller I45 the coil spring I 52 through the chainI50 serves to retract the slide 20 and parts carried thereby and tomaintain said roller in contact with the cam.

Extending laterally from the support I9 is a bracket I54 bifurcated atits free end. Pin 8I is mounted in the bifurcated portion of the bracketand the return spring I43 about such pin bears at its lower end againstthe lower arm of the bifurcated bracket portion and at its upper endagainst a collar I55 fixed to the pin but located inwardly of the upperarm of the bifurcated bracket portion. Lever I38 is pivotally mounted onthe outer end of a bracket I56 also extending laterally from the supportI9.

In the following description of the operation of the machine it will beassumed that a finished piece of work has been removed from the chuck 53and a new piece secured therein. Under such circumstances the motor 85will be operating and the cutter 53 rotating although other parts of themachine will be stationary. Before tightening the chuck on the shank ofthe new piece of work the operator turns the work to bring a wall of aflute against stop finger 82 and maintaining the work in such relationtightens the chuck.

If the work 64 is a new piece on which the machine has not beenoperating the bolts 60 and 6I are loosened and the work holder 22 givenany slight necessary turning movement with the projection as a pivot.This is permitted since the mentioned bolts pass through arcuate slotsin the base of the work holder as best shown in Fig. 1. When the workholder has been turned to a position such that a wall of a flute of thework is positioned at ninety degrees to the axis of the cutter 53 thebolts and SI are tightened to to secure the work holder in thatposition. As shown cutter 53 has flat front and rear sides and is of thewidth of a flute the end face of which is to be bevelled. Therefore thework holder may be adjusted with the projection 56 as a pivot to bring aflute wall into parallel relation with the front or rear face of the clitter 53.

Now lever I26 is used to couple the clutch H0 and the cam shaft H3 isrotated. At this time cam I28 is maintaining lever I38 with its forwardend portion pressing the pin 8| downwardly so that its lower end is in arecess in the disc thus locking the chuck 63 and work 64 againstmovement. The motion imparted to the cutter 53 by the action of the camsI29 and I30 is illustrated by the arrows in Fig. 5.

Thus cam I29 initially functions and rocking the lever 39 brings about adownward movement of the head 2I so that the cutter 53 moves downwardlyin a straight line as indicated by the arrow I51 (in Fig. 5). At the endof such initial straight vertical movement of head 2I the cutter hasenaged the work 64 and the cam I30 comes into play. As it moves theslide forwardly such movement is combined with the continued downwardmovement imparted by cam I29 with the result that the cutter moves at anincline as suggested by the arow I58. This inclined movement is theactual cutting movement and the angle of the incline is determined bythe relative contours of the cams I29 and I30.

At the end of such inclined movement the cut is complete and the highpoint of cam I29 recedes from roller I44 whereupon the springs 30function to raise the head 2I but at this time the slide and the headare held forwardly by the cam I30. The last mentioned vertical movementis indicated by the arrow I59 in Fig. 5. When the vertical returnmovement of the head 2I and cutter 53 has been completed the high pointof cam gall recedes from roller I45 and the coil spring through thechain I50 retracts the slide and the head 2I moving the cutter back tostarting position as indicated by the arrow I60 in Fig. 5.

While the head and cutter are being given the movements indicated by thearrows I59 and I60, that is. the return movements, the work is beingindexed. In this operation as the high point of cam 8 recedes fromroller I36 the spring I43 raises pin 8| from locking relation with thedisc 65 and then the cam I21 depresses plunger I32 and rocks lever 'IIso that its forward end portion raises the rack bar I2 and the teeth ofthe latter meshing with those of the member 61 the latter is given a.turning movement and the pawl I is moved to index the disc 66 and thusshaft 52 and the .chuck and work. At the end of the indexing movementthe cam I23 raises the roller I36 rocking lever I38 to again depress thepin 8i int-o locking relation with the disc 65.

The above described movements of the cutter are then repeated and theface of another flute of the work bevelled. At the end of a completerevolution of the disc 65 (and thus of the shaft 62 and the work 64) thetrip pin I23 on the disc 65 engages and rocks the lever I2I releasingthe rod III and permitting the spring H9 to move such rod to disconnectthe clutch elements. This brings all parts of the machine, with theexcep- Iion of the cutter and its drive. to a stop whereupon thecompleted piece of work may be removed from the chuck 63 and a new pieceof work placed therein.

By using the proper size of cutter I53 and controlling the cuttingmovement thereof as indicated by the arrows I58 the machine may beadapted for the bevelling of the end faces of the flutes of varioussizes of tools 64. The indicated movement of tle cutter is controlled bythe result of the movements imparted by the cams I29 and I30 and theposition of the plate 33 in its relation to the stud 38 enters into suchmovement of the cutter. Said plate 33 and its associated parts providean adjustment to compensate for the rate of feed of head 2I due tovariations of feed caused by the arcuate movement of stud 38 in itsdownward stroke.

On proper adjustment of the plate 33 about pivot 34 the machine may beadapted for the making of bevelled cuts without cam I29 entering intothe inclined cutter movement. In such instance the plate will beinclined opposite to the position in which it is shown and the cam I29will rock the lever 39 to have the cutter 53 moved verticalls asindicated by arrow I'I. Then as the slide is moved forwardly by the camI30 the plate riding under the stud 38 will be forced downwardlycarrying the cutter with it. The cutter being moved downwardly as it ismoved forwardly the resultant movement is at an incline as indicated byarrow I50.

Clearly in such a case the angle at which the cutter is moved willdepend on the angle of adjustment of the plate 33. This plate may beused also to impart vertical movements to the cutter for work other thanthat already described. For example, the plate when adjusted to inclinein the direction shown is adapted for the movement of the cutter in themanner necessary for the cutting of a flute of constant depth in atapered piece supported to have its smaller diameter end first engagedby the cutter. In addition to what has been said the plate need not havea smooth or straight edge engaged by the stud 38 but may be formed asdesired for the imparting of any desired vertical movement or movementsto the cutter. As the plate is bolted in place it will be clear that anyplate may be removed and replaqjd by another plate of any desired shapefor the imparting of the desired movement or movements to a cutter whenthe latter is moved horizontally.

When cuts of even depth are to be made, as grooves or slots. in a piecehaving a contour the desired movement is imparted to the cutter by thecombined action of cam I29 and the plate 33 and cam I30. Any contour cutis made due to the combined action of the parts named and such cuts neednot be of even or constant depth. In

making a contour cut, as a slot or groove in a sphere. half of thecontour cut is determined by the cam I29 and the other half by the plate33. That is, the variable motions, both vertically and horizontally.required for the making of a cut in a ball or sphere or other contourpart requires the use of both the cams I29 and I30 as well as the use ofthe proper plate 33 properly adjusted and then influenced by the camI30.

When cutting shapes which are angular the cutter is controlled only bythe cams I25 and I30 if the angles are substantial. Where a slightincline is being cut-as below 10the inclined movement of the cutter maybe controlled en tirely by the template 33. In cutting on a contour orcurve the combined action of the cams I28 and I30 causes the cutter tofollow the curve as closely as possible with a series of straight linescrossing the curve. Then the template 33 has its engaged edge the exactcurve to be cut and through movements of the cutter against and by thesprings 30 the cutter is moved in the exact curved path desired.

Having thus set forth the nature of my invention. what I claim is:

1. In a machine for milling the end faces of the spiral flutes of atool, a work holder including a horizontally disposed chuck forsupporting a tool from its shank end, a support, a slide horizontallymovable on said support. a head vertically movable on said slide, a.cutter holder carried by said head, means for simultaneously loweringsaid head and moving said slide while the cutter holder is engaging acutter with the free end portions of the tool to ut the latter on anangle, means for indexing the chuck at the end of each such cutfia'ndmeans mfifntm'g' said work holder for pivotal adjustment about avertical axis whereby to support a tool with the wall of a flute the endface of which is being cut disposed at an angle of ninety degrees to theaxis of the cutter.

2'. In a machine for the purpose specified, a cutter holder, meansmounting said cutter holder for up and down movements and for back andforth movements, means for rotating said holder, a work holder includinga chuck, means mounting said chuck for indexing movements about ahorizontal axis, and means mounting said entire work holder for pivotaladjustment about a vertical axis to dispose work at the desired angle tothe axis of a cutter in said holder.

3. In a machine for milling the end faces of the spiral flutes of atool, a bed, a work holder on said bed, a support on said bed, a slidemounted on said support for back and forth horizontal movements, a headmounted on said slide for up and down movements, a. cutter holder onsaid head. means for rotating said cutter holder, a cam shaft on saidbed, means for driving said shaft, a cam on said shaft for impartingforward movements to the slide, a cam on said shaft for impartingdownward movement to said head simultaneously with forward movement ofthe slide when the cutter holder has engaged a cutter with the endportion of a flute of a tool whereby to cut a bevelled face on the same.means then operative to raise said head and retract said slide, saidwork holder including a ch'uck. third and fourth cams on said shaft.means operated by said third cam and looking said chuck against movementduring a cutting operation, means operated by the fourth cam to indexsaid chuck about a horizontal axis while said head is being raised andsaid slide retracted. and means mounting said work holder on said bedfor pivotal adjustment about a vertical axis to have said chuck presentthe work with a wall of a. flute the face of which is being bevelledlocated at the desired angle to the axis of the cutter.

4. The machine as in claim 1 includingggans for stopping said machine atthe end of eachcorfiplete revolution oi'saTd workholdmg chuck.

5. The machine as in claim 3 including means to stop the drive of saidcam shaft at the end of each complete revolution of said work receivingchuck.

6. In a milling machine, a work holder, a slide, means mounting saidslide for horizontal movement, a cutter holder on said slide and movablevertically thereon, means for moving said slide horizontally to carrythe cutter holder toward and from the work holder, a plate on saidcutter holder. a cutter lever bearing at its forward end on the upperside of said plate, a cam engaging the other end of said cutter lever,means pivoting said lever intermediate its ends, spring means constantlyurging said cutter holder upwardly on said slide and maintaining saidplate against said forward end of the cutter lever, and means foradjustin said plate to an angular relation to the horizontal whereby asthe slide is moved horizontally the cutter holder is moved vertically asthe inclined plate is moved under the forward end of said cutter lever.

7. In a milling machine, a work holder, a slide, means mounting saidslide for horizontal movements, a head on said slide and movablevertically thereon, a cutter holder on said head, means for moving slidehorizontally to carry the cutter holder toward and from the work holder,a plate on said head, rigid means at the upper side of said plate,spring means normally maintaining said head in position with said platebearing against said rigid means, and means for adjusting said plate toa position at an angle to the horizontal whereby as the slide is movedhorizontally toward and from the work holder the head is movedvertically as the inclined plate is moved horizontally under said rigidmeans.

8. In a milling machine, a work holder, a slide, means mounting saidslide for horizontal movement, a cutter holder on said slide and movablevertically thereon, means for moving said slide horizontally to carrythe cutter holder toward and from the work holder, a plate movable withsaid cutter holder, bearing means at the upper side of said plate andmounted independent of said slide, spring means normally urging saidplate into engagement with said bearing means, means pivotally mountingsaid plate, threaded means engaging said plate and adapted to adjust thesame about said pivot to position the plate at an angle to thehorizontal, and means for securing the plate in adjusted positionwhereby as the slide is moved horizontally and the plate is carriedhorizontally under said bearing means a vertical movement is imparted tosaid tool holder.

9. In a milling machine, a bed, a work holder on the bed, a support onthe bed, a slide on the support for back and forth horizontal movements,a head mounted on the slide for vertical movements relative thereto, acutter holder on the head, means for rotating the cutter holder, saidbed having an opening therethrough, said work holder including a basehaving a projection at its under side entering said opening and mountingthe work holder for pivotal movement on the bed about a vertical axis,said base including a portion beyond said projection for locking thebase in adjusted positions on the bed, bearing means on the upper sideof the base, horizontally rotatable means including a work receivingchuck mounted by said bearing'means, an index disc fast to saidrotatable means, means turnable on said rotatable means, a pawl on thelast named means for cooperation with said indexing disc to actuate thelatter and index said rotatable means including the work receivingchuck, a cam shaft on said bed, means for driving said shaft, a cam onsaid shaft for imparting forward movements to said slide, a cam on saidshaft for imparting downward movement to said head simultaneously withforward movement of the slide when the cutter holder has engaged acutter with the end portion of a flute of a tool held by said chuckwhereby to cut a bevelled face on the same, means then operative toraise said head and retract said slide, third and fourth cams on saidshaft, means operated by said third cam and locking said chuck againstmovement during a cutting operation, means operated by the fourth camand connected to operate the means turnable on the rotatable means toactuate the pawl and index the chuck while said head is being raised andthe slide retracted, and said pivotal mounting of the base on the bedproviding for disposition of the chuck to present the work with a wallof a flute the face of which is to be bevelled at the desired angle tothe axis of a cutter held by said cutter holder.

10. In a milling machine, a bed, a work holder on the bed, a support onthe bed, a slide on the support for back and forth horizontal movements,a head mounted on the slide for vertical movements relative thereto, acutter holder on the head, means for rotating the cutter holder, saidbed having a circular recess therein, said work holder including a baseon the upper side of said bed, a circular projection on-the under sideof said base and disposed in said recess for guiding pivotal adjustmentof the base on the bed, said base having an arcuate slot therein beyondsaid projection, means on the bed and entering said slot for securingthe base in adjusted position on the bed, bearing means on the outerside of said base, horizontally rotatable means including a workreceiving chuck mounted on said bearing means, anJndexing disc fast tosaid rotatable means, means turnable on said rotatable means, a pawl onthe last named means for cooperation with said indexing disc to actuatethe latter and index said rotatable means including the work receivingchuck, a cam shaft on said bed, means for driving said shaft, a cam onsaid shaft for imparting forward movement to said slide, a cam on saidshaft for imparting downward movement to said head simultaneously withforward movement of the slide when the cutter holder has enaged a cutterwith the end portion of a flute of a tool held by said chuck whereby tocut a bevelled face on the tool, means then operative to raise the headand retract said slide, third and fourth cams on said shaft, meansoperated by said third cam and locking said chuck against movementduring a cutting operation, and means operated by the fourth cam andconnected to operate the means turnable on the rotatable means toactuate the pawl and index the chuck while said head is being raised andthe slide retracted.

11. In a milling machine, a bed, a work holder on the bed, a support onthe bed, a slide on the support for back and forth horizontal movements,a head mounted on the slide for vertical movements relative thereto, acutter holder on the head, means for rotating the cutter holder, saidbed having a circular recess therethrough, said work holder comprising abase having a circular projection on the under side thereof for mountingthe base for pivotal adjustment with said pro- J'ection in said recess,said base including a portion beyond said projection for locking thebase to the bed in adjusted position of the base on the bed, bearingmeans on the upper side of said base, horizontally rotatable meansincluding a work receiving chuck mounted by said bearing means, an indexdisc fast to said rotatable means, means turnable on the rotatablemeans, a pawl on the last named means for cooperation with said indexingdisc to actuate the latter and index said rotatable means including thework receiving chuck, gear teeth on said means, a rack passing throughsaid circular projection and the base and having its teeth meshing withsaid gear teeth, a coil spring connected with said rack and anchored tosaid base and normally tending to maintain the rack in predeterminedrelation with the base, a

cam shaft on said bed, means for driving said shaft, a cam on said shaftfor imparting forward movements to said slide, a cam on the shaft forimparting downward movements to said head simultaneously with forwardmovements of the slide when the cutter holder has engaged a cutter withthe end portion of a flute of a tool held by said chuck whereby to cut abevelled face on the tool, means then operative to raise said head andretract said slide, a third and a fourth cam on said shaft, meansoperated by said third cam and locking said chuck against movementduring a cutting operation, and means operated by the fourth cam toshift said rack against the tendency of said spring and thereby impartmovement to said means turnable on the rotatable means to actuate thepawl and index the chuck while said head is being raised and the slideretracted.

NEWMAN M. MARSILIUS.

